WO2022205223A1

WO2022205223A1 - Random access method, electronic device, and storage medium

Info

Publication number: WO2022205223A1
Application number: PCT/CN2021/084745
Authority: WO
Inventors: 吴作敏
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-06
Also published as: CN117044324A

Abstract

The present application discloses a random access method, comprising: a terminal device obtains first indication information, the first indication information comprising fallback indication information and/or offset value indication information; and the terminal device initiates a random access according to the fallback indication information and/or the offset value indication information. The present application further discloses another random access method, an antenna polarization mode determination method, an electronic device, and a storage medium.

Description

A random access method, electronic device and storage medium

technical field

The present application relates to the field of wireless communication technologies, and in particular, to a random access method, an electronic device, and a storage medium.

Background technique

In the Internet of Things (IoT)-Non-Terrestrial Network (NTN) system, how to improve random access when idle terminal devices that are awakened at different times initiate random access The success rate is the goal that has been pursued.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a random access method, an electronic device, and a storage medium, which can improve the success rate of random access.

In a first aspect, an embodiment of the present application provides a random access method, including: a terminal device acquiring first indication information, where the first indication information includes: fallback indication information and/or offset value indication information;

The terminal device initiates random access according to the fallback indication information and/or the offset value indication information.

In a second aspect, an embodiment of the present application provides a method for determining an antenna polarization mode, including: a terminal device acquires an antenna polarization mode based on third indication information, where the third indication information is used to determine the antenna polarization mode.

In a third aspect, an embodiment of the present application provides a random access method, the method includes:

The network device sends first indication information to the terminal device, where the first indication information includes fallback indication information and/or offset value indication information, and the fallback indication information and/or the offset value indication information are used for all The terminal device initiates random access.

In a fourth aspect, an embodiment of the present application provides a method for determining an antenna polarization mode, the method comprising:

The network device sends third indication information to the terminal device, where the third indication information is used to determine the antenna polarization mode.

In a fifth aspect, an embodiment of the present application provides a terminal device, where the terminal device includes: a first processing unit configured to acquire first indication information, where the first indication information includes: fallback indication information and/or Offset value indication information;

A first sending unit, configured to initiate random access according to the fallback indication information and/or the offset value indication information.

In a sixth aspect, an embodiment of the present application provides a terminal device, where the terminal device includes: a second processing unit configured to acquire an antenna polarization mode based on third indication information, where the third indication information is used to determine an antenna polarization mode.

In a seventh aspect, an embodiment of the present application provides a network device, the network device includes: a second sending unit configured to send first indication information to a terminal device, where the first indication information includes fallback indication information and/or Offset value indication information, the fallback indication information and/or the offset value indication information are used for the terminal device to initiate random access.

In an eighth aspect, an embodiment of the present application provides a network device, where the network device includes: a third sending unit configured to send third indication information to a terminal device, where the third indication information is used to determine an antenna polarization mode.

In a ninth aspect, an embodiment of the present application provides a terminal device, including a processor and a memory for storing a computer program that can be executed on the processor, wherein the processor is configured to execute the above-mentioned terminal when the computer program is executed. The steps of the random access method performed by the device.

In a tenth aspect, an embodiment of the present application provides a terminal device, including a processor and a memory for storing a computer program that can be executed on the processor, wherein the processor is configured to execute the above-mentioned terminal when the computer program is executed. Steps of an antenna polarization mode determination method performed by a device.

In an eleventh aspect, an embodiment of the present application provides a network device, including a processor and a memory for storing a computer program that can be executed on the processor, wherein the processor is configured to execute the above-mentioned computer program when the processor is configured to run the computer program. Steps of a random access method performed by a network device.

In a twelfth aspect, an embodiment of the present application provides a network device, including a processor and a memory for storing a computer program that can be run on the processor, wherein the processor is configured to execute the above-mentioned computer program when running the computer program. Steps of a method for determining an antenna polarization mode performed by a network device.

In a thirteenth aspect, an embodiment of the present application provides a chip, including: a processor, configured to call and run a computer program from a memory, so that a device installed with the chip executes the random access method performed by the above-mentioned terminal device.

In a fourteenth aspect, an embodiment of the present application provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the method for determining an antenna polarization mode performed by the above-mentioned terminal device .

In a fifteenth aspect, an embodiment of the present application provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the random access method performed by the foregoing network device.

In a sixteenth aspect, an embodiment of the present application provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the method for determining an antenna polarization mode performed by the foregoing network device .

In a seventeenth aspect, an embodiment of the present application provides a storage medium that stores an executable program, and when the executable program is executed by a processor, implements the random access method performed by the above-mentioned terminal device.

In an eighteenth aspect, an embodiment of the present application provides a storage medium storing an executable program, and when the executable program is executed by a processor, the above-mentioned method for determining an antenna polarization mode executed by a terminal device is implemented.

In a nineteenth aspect, an embodiment of the present application provides a storage medium that stores an executable program, and when the executable program is executed by a processor, implements the random access method performed by the foregoing network device.

In a twentieth aspect, an embodiment of the present application provides a storage medium storing an executable program, and when the executable program is executed by a processor, the above-mentioned method for an antenna polarization mode executed by a network device is implemented.

In a twenty-first aspect, an embodiment of the present application provides a computer program product, including computer program instructions, the computer program instructions enable a computer to execute the random access method executed by the above-mentioned terminal device.

In a twenty-second aspect, an embodiment of the present application provides a computer program product, including computer program instructions, the computer program instructions enable a computer to execute the above-mentioned method for an antenna polarization mode executed by a terminal device.

In a twenty-third aspect, an embodiment of the present application provides a computer program product, including computer program instructions, and the computer program instructions cause a computer to execute the random access method executed by the foregoing network device.

In a twenty-fourth aspect, an embodiment of the present application provides a computer program product, including computer program instructions, the computer program instructions causing a computer to execute the above-mentioned method for an antenna polarization mode executed by a network device.

In a twenty-fifth aspect, an embodiment of the present application provides a computer program, where the computer program enables a computer to execute the random access method executed by the above-mentioned terminal device.

In a twenty-sixth aspect, an embodiment of the present application provides a computer program, where the computer program causes a computer to execute the method for an antenna polarization mode executed by the terminal device.

In a twenty-seventh aspect, an embodiment of the present application provides a computer program, where the computer program enables a computer to execute the random access method executed by the foregoing network device.

In a twenty-eighth aspect, an embodiment of the present application provides a computer program, where the computer program causes a computer to execute the method for an antenna polarization mode executed by the foregoing network device.

Description of drawings

1 is a schematic diagram of the composition and structure of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of an NTN scenario based on a transparent transmission and retransmission satellite and a regeneration and retransmission satellite provided by an embodiment of the present application;

FIG. 5 is another schematic diagram of an NTN scenario based on a transparent transmission and retransmission satellite and a regeneration and retransmission satellite provided by an embodiment of the present application;

6 is a schematic diagram of alignment of downlink subframes and uplink subframes on the network device side according to an embodiment of the present application;

7 is a schematic diagram of an offset value between a downlink subframe and an uplink subframe on the network device side provided by an embodiment of the present application;

FIG. 8 is a RAR structure diagram corresponding to CEModeA of the application;

Fig. 9 is the RAR structure diagram corresponding to CEModeB of the application;

FIG. 10 is a schematic diagram of an optional processing flow of the random access method provided by the embodiment of the present application;

11 is a sequence diagram of a terminal device initiating random access according to an embodiment of the present application;

FIG. 12 is a schematic diagram of an optional processing flow of a method for determining an antenna polarization mode provided by an embodiment of the present application;

FIG. 13 is a schematic diagram of another optional processing flow of the random access method provided by the embodiment of the present application;

14 is a schematic diagram of another optional processing flow of the method for determining an antenna polarization mode provided by an embodiment of the present application;

FIG. 15 is a schematic structural diagram of an optional composition of a terminal device provided by an embodiment of the present application;

FIG. 16 is a schematic diagram of another optional composition structure of a terminal device provided by an embodiment of the present application;

FIG. 17 is a schematic diagram of an optional composition structure of a network device provided by an embodiment of the present application;

FIG. 18 is a schematic diagram of another optional composition structure of a network device provided by an embodiment of the present application;

FIG. 19 is a schematic structural diagram of a hardware composition of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Before describing the embodiments of the present application, relevant contents are briefly described.

The 3rd Generation Partnership Project (3rd Generation Partnership Project) is researching Non-Terrestrial Network (NTN) technology. The NTN system generally provides communication services to terrestrial users by means of satellite communication. Compared with terrestrial cellular network communication, satellite communication has many unique advantages. First of all, satellite communication is not limited by the user's geographical area. For example, general terrestrial communication cannot cover areas such as oceans, mountains, or deserts that cannot be equipped with communication equipment or cannot be covered due to sparse population. For satellite communication, due to a A satellite can cover a large area of the ground, and the satellite can orbit around the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has high social value. Satellite communications can be covered at low cost in remote mountainous areas and poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technologies, which is conducive to narrowing the digital divide with developed regions and promoting development in these areas. Thirdly, the satellite communication distance is long, and the increase of the communication distance will not significantly increase the cost of communication; finally, the satellite communication has high stability and is not limited by natural disasters.

Communication satellites are classified into Low-Earth Orbit (LEO) satellites, Medium-Earth Orbit (MEO) satellites, Geostationary Earth Orbit (GEO) satellites, and high elliptical orbit satellites according to different orbital altitudes. Orbit (High Elliptical Orbit, HEO) satellites, etc. A brief description of LEO and GEO is given below.

The orbital altitude of LEO ranges from 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between terminal devices is generally less than 20ms. The maximum satellite viewing time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirements of the terminal equipment are not high.

The orbital altitude of MEO ranges from about 8000km to 18000km, and the orbital period is about 5 to 10 hours. The signal propagation delay of single-hop communication between terminal devices is generally less than 50ms, and the maximum satellite visibility time is generally several hours.

GEO orbits at an altitude of 35,786 km and revolves around the Earth for a period of 24 hours. The signal propagation delay of single-hop communication between terminal devices is generally 250ms.

In order to ensure the coverage of satellites and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. ground area.

FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present application. As shown in FIG. 1 , the communication system 100 may include a terminal device 110 and a network device 120 . The network device 120 may communicate with the terminal device 110 through the air interface. Multi-service transmission is supported between the terminal device 110 and the network device 120 .

It should be understood that the embodiment of the present application only uses the communication system 100 for exemplary description, but the embodiment of the present application is not limited thereto. That is to say, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (Long Term Evolution, LTE) system, LTE time division duplex (Time Division Duplex, TDD), universal mobile communication system (Universal mobile communication system) Mobile Telecommunication System (UMTS), Internet of Things (IoT) system, Narrow Band Internet of Things (NB-IoT) system, enhanced Machine-Type Communications (eMTC) system, 5G communication system (also known as New Radio (NR) communication system), or future communication system, etc.

In the communication system 100 shown in FIG. 1 , the network device 120 may be an access network device that communicates with the terminal device 110 . An access network device may provide communication coverage for a particular geographic area, and may communicate with terminal devices 110 (eg, UEs) located within the coverage area.

The network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in a Long Term Evolution (Long Term Evolution, LTE) system, or a next generation radio access network (Next Generation Radio Access Network, NG RAN) device, Or a base station (gNB) in an NR system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 can be a relay station, an access point, a vehicle-mounted device, a wearable Devices, hubs, switches, bridges, routers, or network devices in the future evolved Public Land Mobile Network (PLMN).

The terminal device 110 may be any terminal device, which includes, but is not limited to, a terminal device that adopts a wired or wireless connection with the network device 120 or other terminal devices.

For example, the terminal equipment 110 may refer to an access terminal, a user equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, user agent, or user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, an IoT device, a satellite handset, a Wireless Local Loop (WLL) station, a Personal Digital Assistant , PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolution networks, etc.

The terminal device 110 may be used for device-to-device (Device to Device, D2D) communication.

The wireless communication system 100 may further include a core network device 130 that communicates with the base station, and the core network device 130 may be a 5G core network (5G Core, 5GC) device, for example, an Access and Mobility Management Function (Access and Mobility Management Function). , AMF), another example, authentication server function (Authentication Server Function, AUSF), another example, user plane function (User Plane Function, UPF), another example, session management function (Session Management Function, SMF). Optionally, the core network device 130 may also be an evolved packet core (Evolved Packet Core, EPC) device of an LTE network, for example, a session management function+core network data gateway (Session Management Function+Core Packet Gateway, SMF+PGW- C) Equipment. It should be understood that the SMF+PGW-C can simultaneously implement the functions that the SMF and the PGW-C can implement. In the process of network evolution, the above-mentioned core network equipment may also be called by other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited in this embodiment of the present application.

The various functional units in the communication system 100 may also establish a connection through a next generation network (next generation, NG) interface to implement communication.

For example, the terminal equipment establishes an air interface connection with the access network equipment through the NR interface to transmit user plane data and control plane signaling; the terminal equipment can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); access Network equipment, such as the next generation wireless access base station (gNB), can establish a user plane data connection with the UPF through the NG interface 3 (N3 for short); the access network equipment can establish a control plane signaling with the AMF through the NG interface 2 (N2 for short). connection; UPF can establish a control plane signaling connection with SMF through NG interface 4 (N4 for short); UPF can exchange user plane data with the data network through NG interface 6 (N6 for short); AMF can communicate with SMF through NG interface 11 (N11 for short) The SMF establishes a control plane signaling connection; the SMF can establish a control plane signaling connection with the PCF through the NG interface 7 (N7 for short).

FIG. 1 exemplarily shows one base station, one core network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple base station devices and the coverage area of each base station may include other numbers of terminals equipment, which is not limited in this embodiment of the present application.

3GPP is studying Non Terrestrial Network (NTN, non-terrestrial communication network equipment) technology. NTN generally uses satellite communication to provide communication services to terrestrial users. Compared with terrestrial cellular network communication, satellite communication has many unique advantages. First of all, satellite communication is not limited by the user's geographical area. For example, general terrestrial communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be set up or cannot be covered due to sparse population. For satellite communication, due to a single Satellites can cover a large ground, and satellites can orbit around the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has great social value. Satellite communications can be covered at low cost in remote mountainous areas and poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technologies, which is conducive to narrowing the digital divide with developed regions and promoting development in these areas. Thirdly, the satellite communication distance is long, and the communication cost does not increase significantly when the communication distance increases; finally, the satellite communication has high stability and is not limited by natural disasters.

NTN technology can be combined with various communication systems. For example, NTN technology can be combined with NR system as NR-NTN system. For another example, the NTN technology can be combined with the IoT system to form an IoT-NTN system. As an example, the IoT-NTN system may include an NB-IoT-NTN system and an eMTC-NTN system.

FIG. 2 is a schematic structural diagram of another communication system provided by an embodiment of the present application.

As shown in FIG. 2 , a terminal device 1101 and a satellite 1102 are included, and wireless communication can be performed between the terminal device 1101 and the satellite 1102 . The network formed between the terminal device 1101 and the satellite 1102 may also be referred to as NTN. In the architecture of the communication system shown in FIG. 2 , the satellite 1102 can function as a base station, and the terminal device 1101 and the satellite 1102 can communicate directly. Under the system architecture, satellite 1102 may be referred to as a network device. In some embodiments of the present application, the communication system may include multiple network devices 1102, and the coverage of each network device 1102 may include other numbers of terminal devices, which are not limited in this embodiment of the present application.

FIG. 3 is a schematic structural diagram of still another communication system provided by an embodiment of the present application.

As shown in FIG. 3 , it includes a terminal device 1201 , a satellite 1202 and a base station 1203 , the terminal device 1201 and the satellite 1202 can communicate wirelessly, and the satellite 1202 and the base station 1203 can communicate. The network formed between the terminal device 1201, the satellite 1202 and the base station 1203 may also be referred to as NTN. In the architecture of the communication system shown in FIG. 3, the satellite 1202 may not have the function of the base station, and the communication between the terminal device 1201 and the base station 1203 needs to be relayed by the satellite 1202. Under such a system architecture, the base station 1203 may be referred to as a network device. In some embodiments of the present application, the communication system may include multiple network devices 1203, and the coverage of each network device 1203 may include other numbers of terminal devices, which are not limited in this embodiment of the present application. The network device 1203 may be the network device 120 in FIG. 1 .

It should be understood that the above-mentioned satellite 1102 or satellite 1202 includes but is not limited to:

Low-Earth Orbit (Low-Earth Orbit,) LEO satellites, Medium-Earth Orbit (MEO) satellites, Geostationary Earth Orbit (Geostationary Earth Orbit, GEO) satellites, High Elliptical Orbit (High Elliptical Orbit, HEO) satellites, etc. Wait. Satellites can use multiple beams to cover the ground. For example, a satellite can form dozens or even hundreds of beams to cover the ground. In other words, a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers to ensure satellite coverage and increase the system capacity of the entire satellite communication system.

As an example, the altitude range of LEO can be 500km to 1500km, the corresponding orbital period can be about 1.5 hours to 2 hours, the signal propagation delay of single-hop communication between users can generally be less than 20ms, the maximum satellite visibility time can be 20 minutes, LEO The signal propagation distance is short and the link loss is small, and the transmit power requirements of the user terminal are not high. The orbital height of GEO can be 35786km, the rotation period around the earth can be 24 hours, and the signal propagation delay of single-hop communication between users can generally be 250ms.

It should be noted that, FIG. 1 to FIG. 3 only illustrate systems to which the present application applies in the form of examples, and of course, the methods shown in the embodiments of the present application may also be applied to other systems. Furthermore, the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship. It should also be understood that the "instruction" mentioned in the embodiments of this application may be a direct instruction, an indirect instruction, or an associated relationship. For example, if A indicates B, it can indicate that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indicates B indirectly, such as A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation. It should also be understood that the "correspondence" mentioned in the embodiments of the present application may indicate that there is a direct or indirect corresponding relationship between the two, or may indicate that there is an associated relationship between the two, or may indicate and be indicated , configuration and configuration, etc. It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of the present application can be stored in devices (for example, including terminal devices and network devices) in advance by storing corresponding codes, forms, or other methods that can be used for It is implemented in a manner of indicating related information, and the present application does not limit its specific implementation manner. For example, predefined may refer to the definition in the protocol. It should also be understood that, in the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, such as LTE protocol, NR protocol, and related protocols applied in future communication systems, which are not limited in this application. .

Satellites can be divided into two types: transparent payload and regenerative payload. For the transparent transmission satellite, only the functions of radio frequency filtering, frequency conversion and amplification are provided, and only the transparent transmission of the signal is provided, and the waveform signal transmitted by it will not be changed. For the regenerative repeater satellite, in addition to the functions of radio frequency filtering, frequency conversion and amplification, it can also provide the functions of demodulation/decoding, routing/conversion, coding/modulation, and it has some or all of the functions of the base station.

In NTN, one or more gateways (Gateways) may be included for communication between satellites and terminals.

FIG. 4 and FIG. 5 respectively show schematic diagrams of NTN scenarios based on transparent-transmitting and re-transmitting satellites.

As shown in Figure 4, for the NTN scenario based on transparent transmission and forwarding of satellites, the gateway and the satellite communicate through the feeder link, and the satellite and the terminal can communicate through the service link (service link). As shown in Figure 5, for the NTN scenario based on regenerative and forwarding satellites, the communication between the satellite and the satellite is through InterStar link, the communication between the gateway and the satellite is through the feeder link (Feeder link), and the communication between the satellite and the terminal can communicate through a service link.

The timing relationship of the NTN system will be described below.

In terrestrial communication systems, the propagation delay of signal communication is usually less than 1 ms. In the NTN system, due to the long communication distance between terminal equipment and satellite (or network equipment), the propagation delay of signal communication is very large, ranging from tens of milliseconds to hundreds of milliseconds, depending on the satellite orbit height and The service type of satellite communication is related. In order to deal with the relatively large propagation delay, the timing relationship of the NTN system needs to be enhanced compared to the NR system.

In the NTN system, like the NR system, the UE needs to consider the influence of Timing Advance (TA) when performing uplink transmission. Since the propagation delay in the system is relatively large, the range of the TA value is relatively large. When the UE is scheduled to perform uplink transmission in time slot n (or subframe n), the UE considers the round-trip propagation delay and transmits in advance during uplink transmission, so that when the signal reaches the network device side, the uplink time on the network device side can be increased. on slot n (or subframe n). Specifically, the timing relationship in the NTN system may include two cases, namely case 1 and case 2.

FIG. 6 is a schematic structural diagram of Case 1 in the timing relationship of the NTN system provided by the embodiment of the present application.

As shown in FIG. 6 , for case 1, the downlink subframe and the uplink subframe on the network device side are aligned. Correspondingly, in order to align the uplink transmission of the UE with the uplink subframe on the network device side when it reaches the network device side, the UE needs to use a larger TA value. In some cases, the TA value corresponds to the timing offset value Koffset.

FIG. 7 is a schematic structural diagram of Case 2 in the timing relationship of the NTN system provided by the embodiment of the present application.

As shown in FIG. 7 , for case 2, there is an offset value between the downlink subframe and the uplink subframe on the network device side. In this case, if the UE's uplink transmission is to be aligned with the uplink subframe of the network device side when it reaches the network device side, the UE only needs to use a smaller TA value. In some cases, the TA value corresponds to the timing offset value Koffset. In other cases, the RTT of the UE corresponds to the timing offset value Koffset.

In the IoT-NTN system, the network device needs to send synchronization assistance information such as ephemeris information, satellite moving speed, and/or satellite position, etc. to the terminal device, so that the terminal device can complete the time domain and/or frequency domain synchronization. Correspondingly, the terminal device needs to read the synchronization assistance information sent by the network device, and at the same time complete the corresponding time domain and/or frequency domain synchronization according to its own Global Navigation Satellite System (GNSS) capability. Since the range of TA values in the IoT-NTN system may be very large, in the random access process, the terminal device needs to perform TA pre-compensation according to the estimated TA information before sending the random access preamble sequence, and then perform TA pre-compensation. Transmission of Physical Random Access Channel (PRACH) sequences.

When the terminal device is in the idle state, if the terminal device receives a paging message or receives a wake up signal (Wake up signal, WUS), the terminal device needs to perform time-frequency synchronization after receiving the paging message or WUS, and then Further transmission is performed, for example, a random access procedure is initiated.

In addition, in the IoT-NTN scenario, the antenna polarization mode of the satellite can include Right Hand Circular Polarization (RHCP), Left Hand Circular Polarization (LHCP), and Linear Polarization (LP) one of the. The antenna polarization mode of the terminal device also includes one of right-handed polarization, left-handed polarization and linear polarization.

The random access procedure is briefly described below. The random access procedure of the terminal equipment may include four steps:

In the first step, the terminal device sends a random access preamble sequence (Preamble, also called Message 1, Msg1) to the network device according to the determined random access parameter. In the eMTC system, the Preamble can be repeatedly transmitted and transmitted with frequency hopping. For each coverage enhancement level, the PRACH parameters configured by the network device include the number of repeated transmissions of the Preamble and an indication of whether to perform frequency hopping transmission.

In the second step, the network device sends a random access response (RAR, that is, Message 2, Msg2) to the terminal device after detecting that there is an access preamble sequence sent by the terminal device to inform the terminal device that it is OK to send message 3 (Message 3, Msg3). The uplink resource information used, assigns a temporary RNTI to the terminal device, provides a timing advance command to the terminal device, etc. Correspondingly, the terminal device is based on the random access (Random Access, RA)-Radio Network Temporary Identifier (Radio Network Temporary Identifier, RNTI) ) to detect the random access response (Random Access Response, RAR). If the terminal device does not detect RAR in the RAR window, the terminal device retransmits the PRACH sequence. If the terminal device detects the RAR in the RAR window, the terminal device grants the uplink (Up Link, UL) according to the RAR indicated by the RAR. Carry out the transmission of Msg3.

In the third step, after receiving the RAR, the terminal device sends the Msg3 message in the uplink resource specified by the random access response message. This step allows hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) retransmission. Wherein, if the PRACH parameters determined by the terminal device correspond to coverage enhancement levels 0 and 1, the RAR content is parsed according to the format of CEModeA; if the PRACH parameters determined by the terminal device correspond to

coverage enhancement levels

2 and 3, the RAR content is parsed according to the format of CEModeB.

The terminal equipment in the eMTC system is also called narrowband low complexity (Bandwidth reduced Low complexity, BL)/Coverage Enhancement (Coverage Enhancement, CE) terminal equipment (User Equipment, UE). BL/CE UE includes CEModeA and CEModeB modes. The bandwidth received and transmitted by the BL/CE UE is narrowband, including 6 consecutive RBs in the LTE cell bandwidth. If the bandwidth of the LTE cell is greater than 6 RBs, the bandwidth of the LTE cell may include multiple narrowbands. Each narrowband corresponds to a narrowband number.

The RAR structure diagram corresponding to CEModeA is shown in Figure 8. Wherein, R is a reserved bit of 1 bit, the TA command includes 11 bits, the uplink grant (that is, the RAR UL grant) includes 20 bits, and the TC-RNTI includes 16 bits.

The RAR structure diagram corresponding to CEModeB is shown in Figure 9. Wherein, R is a reserved bit of 1 bit, the TA command includes 11 bits, the uplink grant (that is, the RAR UL grant) includes 12 bits, and the TC-RNTI includes 16 bits.

In the fourth step, the network device sends a Msg4 message to the terminal device, where the Msg4 message includes a contention resolution message, and allocates uplink transmission resources for the terminal device at the same time, and this step allows HARQ retransmission. When the terminal device receives the Msg4 sent by the network device, it will detect whether the Msg4 includes part of the content in the Msg2 message sent by the terminal device. If it is included, it indicates that the random access process of the terminal device is successful, otherwise, it is considered that the random access process fails, and the terminal device needs to initiate the random access process from the first step again.

In the IoT-NTN system, when the terminal device is in the idle state, if the terminal device receives a paging message or receives WUS, the terminal device needs to perform time-frequency synchronization after receiving the paging message or WUS, and then To perform uplink and downlink transmission, for example, initiate a random access procedure. Since the time-frequency synchronization of the terminal device in the IoT-NTN system needs to read the synchronization auxiliary information such as ephemeris information, satellite moving speed, and/or satellite position, etc. sent by the network device through, for example, system messages, it is woken up at different times. Multiple terminal equipments may read the same system message carrying synchronization assistance information, so that the multiple terminal equipments have a high probability to select the same PRACH resource to send the random access preamble sequence, and then may send a PRACH collision.

In addition, in IoT-NTN scenarios, adjacent cells may use different polarization modes to reduce inter-cell interference. If the antenna polarization patterns of the satellite and the terminal equipment match, the receiving performance can be increased; if the antenna polarization patterns of the satellite and the terminal equipment do not match, the receiving performance can be reduced or even the signal cannot be received. Therefore, both the downlink transmission and the uplink transmission in the IoT-NTN scenario need to notify the antenna polarization mode.

It should be understood that, in the various embodiments of the present application, the size of the serial numbers of each implementation process does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

An optional processing flow of the random access method provided by the embodiment of the present application, as shown in FIG. 10 , may at least include the following steps:

Step S201, the terminal device acquires first indication information, where the first indication information includes: fallback indication information and/or offset value indication information.

In some embodiments, the terminal device may receive the first indication information sent by the network device, and the terminal device may also acquire the first indication information according to a predefined rule. As an example, if the terminal device receives the first indication information sent by the network device, the first indication information may be obtained through a system message, a paging message, a wake-up signal, a radio resource control (Radio Resource Control, RRC) signal Command, Media Access Control Control Element (Media Access Control Control Element, MAC CE) and downlink control information (Downlink Control Information, DCI) at least one is carried; The system message can also include ephemeris information, the system The messages may be NTN-specific system messages.

In some embodiments, the fallback indication information and the offset value indication information may be carried in the same information, or may be carried in different information. As an example, the first indication information is a paging message, and the paging message carries the fallback indication information and the offset value indication information. As another example, the first indication information includes a system message and wake-up indication information, the system message carries the fallback indication information, and the wake-up indication information carries the offset value indication information.

In some embodiments, the first indication information includes at least one backoff indication information (Backoff Indicator, BI), and each of the backoff indication information corresponds to a first backoff parameter. Optionally, the BI can be used to determine the load situation of the cell.

In some embodiments, the fallback indication information may include 4 bits. As an example, the fallback parameter indicated by the fallback indication information may be as shown in Table 1 below; if the terminal device determines that the fallback indication information indicates "10", then The terminal device determines that the value of the backoff parameter is 320ms; if the terminal device determines that the backoff indication information indicates "Reserved", the terminal device determines that the value of the backoff parameter is 960ms, the maximum value shown in Table 1.

Table 1

IndexIndex	Backoff Parameter value(ms)Backoff Parameter value(ms)
00	00
11	1010
22	2020
33	3030
44	4040
55	6060
66	8080
77	120120
88	160160
99	240240
1010	320320
1111	480480
1212	960960
1313	ReservedReserved
1414	ReservedReserved
1515	ReservedReserved

In some embodiments, the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters. As an example, the at least one fallback indication information may have a first correspondence with at least one coverage enhancement level; or, the at least one fallback indication information may have a first correspondence with at least one set of random access parameters; or , the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and at least one set of random access parameters.

In some embodiments, the first correspondence includes one of the following: a fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters, and a fallback indication information corresponds to at least two coverages The enhancement level and/or at least two groups of random access parameters, and the at least two fallback indication information correspond to one coverage enhancement level and/or a group of random access parameters. For example, the first correspondence may be that the first fallback indication information corresponds to coverage enhancement level 0 and the first random access parameter; the first correspondence may also be that the first fallback indication information corresponds to coverage enhancement level 0 and the first random access parameter. The random access parameter, and the first fallback indication information correspond to coverage enhancement level 1 and the second random access parameter; the first correspondence may also be that both the first fallback indication information and the second fallback indication information correspond to the coverage enhancement level 0 and the first random access parameter. As an example that one fallback indication information corresponds to one coverage enhancement level, the first indication information includes 4 fallback indication information. As an example, fallback indication information 1 corresponds to coverage enhancement level 0, and fallback indication information 2 corresponds to coverage enhancement level 1 , the fallback indication information 3 corresponds to the coverage enhancement level 2, and the fallback indication information 4 corresponds to the coverage enhancement level 3.

In some embodiments, the first correspondence is obtained through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI; or, the first correspondence is based on a predefined rule Obtain. For example, the first correspondence may be carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI. As an example, the system message may further include ephemeris information, and the system message may be a system message dedicated to NTN.

In some optional implementation manners, the terminal device may determine a second fallback parameter according to the fallback indication information and/or the offset value indication information.

In some optional implementation manners, the terminal device determines the second fallback parameter according to the fallback indication information and/or the offset value indication information, which may include:

Step S1a, the terminal device determines a first coverage enhancement level and/or a first group of random access parameters.

In some embodiments, the terminal device may determine the first coverage enhancement level and/or the first set of random access parameters corresponding to the terminal device according to the capability of the terminal device.

In other embodiments, the terminal device may also determine the first coverage enhancement level and/or the first set of random access parameters according to the RSRP measurement result.

For example, in the eMTC system, the terminal device can determine which set of PRACH parameters to use to initiate random access according to the indication information sent by the network device, such as higher layer parameters or indication information in the PDCCH order. Alternatively, if the network device does not send the indication information for indicating the PRACH parameter, the terminal device may select the PRACH parameter corresponding to the appropriate coverage enhancement level according to the currently measured RSRP and the configured RSRP threshold to initiate random access. The network device can configure 4 sets of random access parameters for the system, corresponding to

coverage enhancement levels

0, 1, 2, and 3 respectively. As an example, coverage enhancement level 0 corresponds to a scene with the best signal strength, and coverage enhancement level 3 corresponds to a scene with the worst signal strength. Terminal devices corresponding to coverage enhancement levels 0 and 1 support CEModeA, and terminal devices corresponding to

coverage enhancement levels

2 and 3 support CEModeB. Correspondingly, the network device is configured with RSRP threshold 3, RSRP threshold 2 and RSRP threshold 1.

In the following, for the scenarios in which the terminal device supports CEModeA and the terminal device supports CEModeB, the determination of the coverage enhancement level of the terminal device is described respectively.

If the terminal device supports CEModeB (that is, the terminal device supports coverage enhancement levels 2 and 3), the terminal device can select the appropriate random access parameter corresponding to the coverage enhancement level according to the currently measured RSRP and the configured RSRP threshold to initiate random access . If the measured RSRP is less than the RSRP threshold 3, the terminal device determines the coverage enhancement level 3; or, if the measured RSRP is less than the RSRP threshold 2, the terminal device determines the coverage enhancement level 2; or, if the measured RSRP is less than the RSRP threshold 1, the terminal device determines coverage enhancement level 1; otherwise, the terminal device determines coverage enhancement level 0.

If the terminal device supports CEModeA and does not support CEModeB (that is, the terminal device supports coverage enhancement levels 1 and 0), the terminal device can select the appropriate PRACH parameter corresponding to the coverage enhancement level according to the currently measured RSRP and the configured RSRP threshold to initiate random access. If the measured RSRP is less than the RSRP threshold 1, the terminal device determines coverage enhancement level 1; otherwise, the terminal device determines coverage enhancement level 0.

After determining the coverage enhancement level, the terminal device may determine the random access parameter according to the correspondence between the coverage enhancement level and the random access parameter.

In still other embodiments, the terminal device may further determine the first coverage enhancement level and/or the first group of random access parameters according to the second indication information sent by the network device; the second indication The information is carried through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI. As an example, the system message may further include ephemeris information, the system message may be a system message dedicated to NTN, and the second indication information is determined according to the capability reported by the terminal device. As an example, the network device determines second indication information according to the capability reported by the terminal device, and the second indication information is used by the terminal device to determine the first coverage enhancement level and/or the first group of random access parameters; the network device The second indication information is then sent to the terminal device.

Step S1b, the terminal device determines the first coverage enhancement level and/or the first corresponding to the first set of random access parameters in the at least one fallback indication information based on the first correspondence. A fallback parameter.

For example, the terminal device determines the first correspondence shown in Table 2 through system messages, paging messages, wake-up signals, RRC signaling, MAC CE, or DCI, or according to predefined rules, and the fallback indication information 1 corresponds to Coverage enhancement level 0 and random access parameter set 1, fallback indication information 2 corresponds to coverage enhancement level 1 and random access parameter set 2, fallback indication information 3 corresponds to coverage enhancement level 2 and random access parameter set 3, fallback Indication information 4 corresponds to coverage enhancement level 3 and random access parameter set 4.

Table 2

覆盖增强等级Override Enhancement Level	随机接入参数配置Random access parameter configuration	回退指示信息fallback instructions
00	随机接入参数集合1Random Access Parameter Set 1	回退指示信息1 Fallback Instructions 1
11	随机接入参数集合2Random access parameter set 2	回退指示信息2 Fallback Instructions 2
22	随机接入参数集合3Random access parameter set 3	回退指示信息3 Fallback Instructions 3
33	随机接入参数集合4Random access parameter set 4	回退指示信息4 Fallback Instructions 4

If the first coverage enhancement level and the first group of random access parameters determined in step S1a are coverage enhancement level 0 and random access parameter set 1, respectively, the terminal device determines that the first fallback parameter corresponds to fallback indication information 1 If the first coverage enhancement level and the first group of random access parameters determined in step S1a are coverage enhancement level 1 and random access parameter set 2, respectively, the terminal device determines that the first fallback parameter is a fallback indication value corresponding to information 2; if the first coverage enhancement level and the first group of random access parameters determined in step S1a are coverage enhancement level 2 and random access parameter set 3, respectively, the terminal device determines that the first fallback parameter is The value corresponding to the fallback indication information 3; if the first coverage enhancement level and the first group of random access parameters determined in step S1a are the coverage enhancement level 3 and the random access parameter set 4, respectively, the terminal device determines the first return The fallback parameter is the value corresponding to fallback indication information 4.

The optional implementation manner for the terminal device to determine the first fallback parameter has been described above, and the optional implementation manner for the terminal device to determine the first offset value is described below.

In some embodiments, the first indication information may include at least one offset value, and the at least one offset value is used to determine the first offset value.

In some examples, the first offset value corresponds to a timing advance offset (TA). In other examples, the first offset value corresponds to Round Trip Time (RTT).

In some embodiments, the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters. The second correspondence may include one of the following: one offset value corresponds to one coverage enhancement level and/or a set of random access parameters; one offset value corresponds to at least two coverage enhancement levels and/or at least two A group of random access parameters; at least two offset values correspond to a coverage enhancement level and/or a group of random access parameters. As an example, the second correspondence may be acquired through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI. As an example, the second correspondence may be carried in system messages, paging messages , at least one of wake-up signal, RRC signaling, MAC CE, and DCI; or, the second correspondence is obtained according to a predefined rule.

For example, an offset value of 0 corresponds to a coverage enhancement level of 0 and a random access parameter of 1. Alternatively, an offset value of 0 corresponds to coverage enhancement level 0 and random access parameter 1, and an offset value of 0 corresponds to coverage enhancement level 1 and random access parameter 2. Alternatively, the offset value 0 corresponds to the coverage enhancement level 0 and the random access parameter 1, and the offset value 1 corresponds to the coverage enhancement level 0 and the random access parameter 1.

In some optional implementation manners, the terminal device acquiring the first fallback parameter and/or the first offset value based on the first indication information may include:

Step S1c, the terminal device determines a first coverage enhancement level and/or a first group of random access parameters.

In some embodiments, the process of determining the first coverage enhancement level and/or the first group of random access parameters by the terminal device may be the same as the determination of the first coverage enhancement level and/or the first group of random access parameters by the terminal device in step S1a. The processing procedure of the access parameter is the same, and will not be repeated here.

Step S1d, the terminal device determines the first coverage enhancement level and/or the first set of random access parameters corresponding to the first coverage enhancement level in the at least one offset value based on the second correspondence offset value.

In some embodiments, the second correspondence may be as shown in Table 3 below. If the terminal device determines coverage enhancement level 0 and random access parameter set 1, the terminal device determines the first offset value according to the second correspondence The offset value is 1; if the terminal device determines the coverage enhancement level 1 and the random access parameter set 2, the terminal device determines the first offset value according to the second correspondence to the offset value 2; if the terminal device determines the coverage enhancement level 2 and Random access parameter set 3, the terminal device determines the first offset value according to the second correspondence The relationship determines that the first offset value is an offset value of four.

table 3

覆盖增强等级Override Enhancement Level	随机接入参数配置Random access parameter configuration	第一偏移值first offset value
00	随机接入参数集合1Random Access Parameter Set 1	偏移值1offset value 1
11	随机接入参数集合2Random access parameter set 2	偏移值2offset value 2
22	随机接入参数集合3Random access parameter set 3	偏移值3offset value 3
33	随机接入参数集合4Random access parameter set 4	偏移值4offset value 4

Step S1e, the terminal device determines a second fallback parameter based on the first fallback parameter and the first offset value.

In some embodiments, the terminal device determines a first backoff parameter value according to the first backoff parameter, and randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, The second backoff parameter value is obtained by offsetting the first offset value forward or backward from the first backoff time.

In other embodiments, the terminal device determines a first backoff parameter value based on the first backoff parameter, and randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value , and the first backoff time is taken as the second backoff parameter value.

In still other embodiments, the terminal device determines a first backoff parameter value based on the first backoff parameter, which is uniformly distributed between 0 and the sum of the first backoff parameter value and the first offset value The first backoff time is randomly selected from the value of , and the first backoff time is used as the second backoff parameter value.

Step S202, the terminal device initiates random access based on the first fallback parameter and/or the first offset value indication information.

In some embodiments, the terminal device determines a second fallback parameter based on the first fallback parameter and/or the first offset value indication information, and the terminal device initiates random access based on the second fallback parameter input; as an example, the terminal device determines the first PRACH resource based on the second fallback parameter; the terminal device sends the PRACH on the first PRACH resource. As an example, the terminal device determines a fallback parameter according to the fallback indication information and/or the offset value indication information, where the offset value indication information is used to indicate a first offset value; the terminal device Random access is initiated according to the fallback parameter.

In some embodiments, determining the first PRACH resource by the terminal device based on the second fallback parameter may include at least one of the following manners:

The terminal device determines a first fallback parameter value based on the first fallback parameter, randomly selects a first fallback time from values uniformly distributed between 0 and the first fallback parameter value, and assigns the first fallback time to the first fallback parameter. A backoff time is used as a second backoff parameter value, and the first PRACH resource is determined based on the second backoff parameter value. For example, the first PRACH resource is the first available PRACH resource after the second backoff parameter value.

Alternatively, the terminal device determines a first fallback parameter value based on the first fallback parameter, randomly selects a first fallback time from values evenly distributed between 0 and the first fallback parameter value, and selects a first fallback time from all The first backoff time is shifted forward or backward by a first offset value to obtain a second backoff parameter value; and the first PRACH resource is determined based on the second backoff parameter value. As an example, the terminal device determines the first PRACH resource based on the second backoff parameter value, which may be the terminal device selects the first PRACH resource by offsetting the first offset value forward or backward based on the first backoff time. For example, the first PRACH resource is the first available PRACH resource after the second backoff parameter value.

Alternatively, the terminal device determines a first fallback parameter value based on the first fallback parameter, from values uniformly distributed between 0 and the sum of the first fallback parameter value and the first offset value A first backoff time is randomly selected, the first backoff time is used as a second backoff parameter value, and the first PRACH resource is determined based on the second backoff parameter value. For example, the first PRACH resource is the first available PRACH resource after the second backoff parameter.

The sequence diagram of the terminal device initiating random access, as shown in Figure 11, if the network device indicates the first offset value through the system message and the fallback parameter value through the paging message, the terminal device will change from 0 to the fallback parameter value. The first backoff time is randomly selected from a uniformly distributed value between T, and a time T is obtained after considering the first offset value, and a random access is initiated after the T time.

The processing flow of the random access method provided by the embodiment of the present application is described below with an example.

If the terminal device determines the corresponding coverage enhancement level 3, the terminal device can determine the fallback indication information 4 and the offset value 4 according to Table 2 and Table 3, and determine the fallback parameter 4 based on the fallback indication information 4, from 0 and the fallback parameter Select a random back-off time from the values evenly distributed among 4, such as T4; extend the subsequent random access transmission by T4 time; after considering the offset value of 4, perform random access resource allocation according to the random access parameter set 4. choose.

If the terminal device determines the corresponding coverage enhancement level 2, the terminal device can determine the fallback indication information 3 and the offset value 3 according to Table 2 and Table 3, and determine the fallback parameter 3 based on the fallback indication information 3, from 0 and the fallback parameter Select a random back-off time from the values evenly distributed among 3, such as T3; extend the subsequent random access transmission by T3 time; after considering the offset value 3, perform random access resource allocation according to the random access parameter set 3. choose.

If the terminal device determines the corresponding coverage enhancement level 1, the terminal device can determine the fallback indication information 2 and the offset value 2 according to Table 2 and Table 3, and determine the fallback parameter 2 based on the fallback indication information 2, from 0 and the fallback parameter Select a random backoff time from the values evenly distributed between 2, such as T2; extend the subsequent random access transmission by T2 time; after considering the offset value 2, perform random access resource allocation according to the random access parameter set 2. choose.

If the terminal device determines the corresponding coverage enhancement level 0, the terminal device can determine the fallback indication information 1 and the offset value 1 according to Table 2 and Table 3, and determine the fallback parameter 1 based on the fallback indication information 1, from 0 and the fallback parameter Select a random back-off time from the values evenly distributed between 1 and 1, such as T1; extend the subsequent random access transmission by T1 time; after considering the offset value of 1, perform random access resource allocation according to the random access parameter set 1. choose.

In some examples, if the terminal device determines the corresponding coverage enhancement level x (x is 0 or 1 or 2 or 3), the terminal device can determine the fallback indication information y (y is 1 or 2 or 3 or 4) according to Table 2 , determine the back-off parameter y based on the back-off indication information y, and select a random back-off time, such as Ty, from the values uniformly distributed between 0 and the back-off parameter y; extend the subsequent random access transmission by the time Ty; The access parameter set y is used to select random access resources.

In some examples, if the terminal device determines the corresponding coverage enhancement level x (x is 0 or 1 or 2 or 3), the terminal device can determine the fallback indication information y and the offset value y according to Table 2 and Table 3 (y is 1 or 2 or 3 or 4), determine the back-off parameter y based on the back-off indication information y, select a random back-off time from values uniformly distributed between 0 and the back-off parameter y, and increase the random back-off time Or reduce the offset value y to obtain Ty; extend the subsequent random access transmission for Ty time; select random access resources according to the random access parameter set y.

In the random access method provided by this embodiment of the present application, the terminal device determines the first indication information according to a predefined rule, or the terminal device receives the first indication information sent by the network device; the terminal device can determine the first fallback parameter according to the first indication information and/or the first offset value; after the terminal device in the idle state performs time-frequency synchronization based on the paging message or wake-up signal, it does not directly select random access resources to initiate random access, but the first A backoff parameter and/or the first offset value determines a backoff time that is extended for subsequent random access transmissions. In this way, the success rate and efficiency of random access can be improved, and in the IoT-NTN system, multiple terminal devices that are woken up at different times may read the same system message carrying synchronization auxiliary information, causing the multiple terminals to wake up. The device has a high probability to select the same PRACH resource to send the random access preamble sequence to generate a PRACH collision.

It should be noted that the random access method provided in the embodiment of the present application can be applied to an initial random access process.

An optional processing flow of the method for determining an antenna polarization mode provided by this embodiment of the present application, as shown in FIG. 12 , may at least include the following steps:

Step S301, the terminal device acquires an antenna polarization mode based on third indication information, where the third indication information is used to determine the antenna polarization mode.

In some embodiments, the terminal device acquires the third indication information according to a predefined rule; or, the terminal device receives the third indication information sent by the network device. As an example, the third indication information may be determined by a predefined rule, or the third indication information is sent by the network device to the terminal device.

In some embodiments, the third indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI. Optionally, the system message may further include ephemeris information; the system message may be an NTN dedicated system system message.

In some embodiments, the antenna polarization mode may include: the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relationship.

In some embodiments, the first association relationship may include: the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; and/or the first association relationship is obtained through system messages, paging messages, At least one of wake-up signal, RRC signaling, MAC CE and DCI is carried; or, the second association relationship is obtained according to a predefined rule. Optionally, the system message may further include ephemeris information; the system message may be an NTN dedicated system message.

In some embodiments, the downlink antenna polarization mode may include at least one of the following: Right Hand Circular Polarization (RHCP), Left Hand Circular Polarization (LHCP), and Linear Polarization Linear Polarization (LP). As an example, the uplink antenna polarization mode includes at least one of the following: right-handed polarization, left-handed polarization, and linear polarization.

In some embodiments, the third indication information may be used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization. If the third indication information does not indicate an antenna polarization mode, the antenna polarization mode may be linear polarization.

In some embodiments, the third indication information is used to determine an antenna polarization mode, including one of the following cases: the third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the the polarization mode of the downlink antenna is the same; the third indication information indicates the polarization mode of the uplink antenna, and the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; the third indication information indicates the polarization mode of the downlink antenna , the uplink antenna polarization mode is the default configuration; the third indication information indicates the uplink antenna polarization mode, the downlink antenna polarization mode is the default configuration and the third instruction information indicates the downlink antenna polarization mode and uplink Antenna polarization mode.

In some embodiments, the antenna polarization mode and the cell ID have a second association relationship; for example, the network device indicates that a cell whose cell ID modulo 2 is 0 corresponds to RHCP, and a cell whose cell ID modulo 2 is 1 corresponds to LHCP. For another example, the network device indicates that a cell whose cell ID modulo 2 is 0 corresponds to LHCP, and a cell whose cell ID modulo 2 is 1 corresponds to RHCP.

In some embodiments, the second association relationship may be carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI; or, the second association relationship may be based on a predetermined Define the rules to get. Optionally, the system message may further include ephemeris information; the system message may be an NTN dedicated system system message.

In some embodiments, the second association relationship is used for radio resource management (Radio Resource Management, RRM) measurement and/or radio link monitoring (Radio Link Monitoring, RLM) measurement of the neighboring cell. For example, the network device can indicate the antenna polarization mode of the neighboring cell through a system message or RRC signaling or MAC CE or DCI, for example, indicating the association between the antenna polarization mode and the cell ID, and the terminal device can perform the operation according to the indicated association. RRM measurements of neighboring cells.

In some embodiments, the network device may configure whether to support circular polarization. If circular polarization is supported, the second association relationship may be predefined. For example, the predefined cell ID is an odd-numbered cell associated with RHCP, and the cell ID is an even-numbered one. The cell is associated with LHCP; or, if circular polarization is not supported, the antenna polarization mode is LP.

In some embodiments, the second association relationship may represent the association relationship between the uplink antenna polarization mode and the cell ID. For example, the network device may indicate {cell ID 0, uplink polarization mode 0}, {cell ID 1, uplink polarization mode 1}, {cell ID 2, uplink polarization mode 2}. If the terminal device accesses the network device through cell 0, it adopts the corresponding uplink polarization mode 0 for data transmission; or, if the terminal device accesses the network device through cell 1, it adopts the corresponding uplink polarization mode 1 for data transmission; Alternatively, if the terminal device accesses the network device through cell 2, it uses the corresponding uplink polarization mode 2 for data transmission.

In this embodiment of the present application, the terminal device receives the third indication information sent by the network device, or the terminal device obtains the third indication information according to a predefined rule, and the terminal device determines the antenna polarization mode based on the third indication information, so that the network device Polarization mode matching of terminal equipment (such as satellites) and terminal equipment, increasing the performance of the system to receive and transmit data.

Another optional processing flow of the random access method provided by the embodiment of the present application, as shown in FIG. 13 , includes the following steps:

Step S401, the network device sends first indication information to the terminal device, where the first indication information includes fallback indication information and/or offset value indication information, the fallback indication information and/or the offset value indication information for the terminal device to initiate random access.

In some embodiments, the first fallback parameter and/or the first offset value indication information is determined for the first indication information and the first indication information, and the terminal device is based on the first fallback parameter and/or the first fallback parameter The description of initiating random access by an offset value indication information is the same as the related description in the above-mentioned embodiment shown in FIG. 10 , and will not be repeated here.

Another optional processing flow of the method for determining an antenna polarization mode provided in this embodiment of the present application, as shown in FIG. 14 , may at least include the following steps:

Step S501, the network device sends third indication information to the terminal device, where the third indication information is used to determine the antenna polarization mode.

In some embodiments, the description about the third indication information and the determination of the antenna polarization mode by the terminal device based on the third indication information is the same as the relevant description in the embodiment shown in FIG. 12 , and details are not repeated here.

It should be noted that, in each embodiment of the present application, the terminal device may be an N-IoT terminal device or an eMTC terminal device.

To implement the random access method provided by the embodiment of the present application, the embodiment of the present application further provides a terminal device. An optional composition structure of the terminal device 600, as shown in FIG. 15 , includes:

The first processing unit 601 is configured to obtain first indication information, wherein the first indication information includes: fallback indication information and/or offset value indication information;

The first sending unit 602 is configured to initiate random access according to the backoff indication information and/or the offset value indication information.

In some embodiments, the first processing unit 601 is configured to acquire the first indication information according to a predefined rule; or, receive the first indication information sent by a network device.

In some embodiments, the first processing unit 601 is configured to determine a second fallback parameter according to the fallback indication information and/or the offset value indication information, wherein the offset value indication information uses to indicate the first offset value;

The terminal device initiates random access according to the second fallback parameter.

In some embodiments, the first indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.

In some embodiments, the first indication information includes one or more fallback indication information, and each of the fallback indication information corresponds to a first fallback parameter.

In some embodiments, the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.

In some embodiments, the first correspondence includes one of the following:

A fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters;

One fallback indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two fallback indications correspond to one coverage enhancement level and/or a set of random access parameters.

In some embodiments, the first correspondence is obtained through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI; or, the first correspondence is based on a predefined rule Obtain.

In some embodiments, the first processing unit 601 is configured to determine a first coverage enhancement level and/or a first group of random access parameters; based on the first correspondence, in the at least one fallback indication information in determining the first coverage enhancement level and/or the first fallback parameter corresponding to the first group of random access parameters.

In some embodiments, the offset value indication information includes at least one offset value used to determine the first offset value.

In some embodiments, the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.

In some embodiments, the second correspondence includes one of the following:

An offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

One offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.

In some embodiments, the second correspondence is obtained through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE, and DCI;

Alternatively, the second corresponding relationship is acquired according to a predefined rule.

In some embodiments, the first processing unit 601 is configured to determine a first coverage enhancement level and/or a first set of random access parameters; based on the second correspondence, in the at least one offset value The first offset value corresponding to the first coverage enhancement level and/or the first group of random access parameters is determined.

In some embodiments, the first processing unit 601 is configured to perform at least one of the following:

determining the first coverage enhancement level and/or the first group of random access parameters corresponding to the terminal device according to the capability of the terminal device;

determining the first coverage enhancement level and/or the first group of random access parameters according to the RSRP measurement result;

The first coverage enhancement level and/or the first group of random access parameters are determined according to the second indication information sent by the network device.

In some embodiments, the second indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.

In some embodiments, the second indication information is determined according to the capability reported by the terminal device.

In some embodiments, the first sending unit 602 is configured to determine a first PRACH resource based on the first backoff parameter and/or the first offset value; send PRACH on the first PRACH resource .

In some embodiments, the first sending unit 602 is configured to determine a first backoff parameter value based on the first backoff parameter, from values uniformly distributed between 0 and the first backoff parameter value Randomly selecting a first backoff time, and determining the first PRACH resource based on the first backoff time; or,

A first backoff parameter value is determined based on the first backoff parameter, a first backoff time is randomly selected from values uniformly distributed between 0 and the first backoff parameter value, and based on the first backoff time and the first offset value to determine the first PRACH resource; or,

A first backoff parameter value is determined based on the first backoff parameter, and a first backoff is randomly selected from 0 and a uniformly distributed value between 0 and the sum of the first backoff parameter value and the first offset value time, and the first PRACH resource is determined based on the first backoff time.

In some embodiments, the fallback indication information and the offset value indication information may be carried in the same information; or, the fallback indication information and the offset value indication information may be carried in different pieces of information .

In order to implement the method for determining the antenna polarization mode provided by the embodiment of the present application, the embodiment of the present application further provides another terminal device. The optional composition structure of the terminal device 800, as shown in FIG. 16 , includes:

The second processing unit 801 is configured to acquire an antenna polarization mode based on third indication information, where the third indication information is used to determine the antenna polarization mode.

In some embodiments, the second processing unit 801 is configured to acquire the third indication information according to a predefined rule; or, receive the third indication information sent by a network device.

In some embodiments, the third indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.

In some embodiments, the antenna polarization modes include: downlink antenna polarization modes and/or uplink antenna polarization modes.

In some embodiments, the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relationship.

In some embodiments, the first association relationship includes: the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; and/or,

The first association relationship is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.

In some embodiments, the downlink antenna polarization mode includes at least one of the following: right-handed polarization, left-handed polarization, and linear polarization.

In some embodiments, the uplink antenna polarization mode includes at least one of the following: right-handed polarization, left-handed polarization, and linear polarization.

In some embodiments, the third indication information is used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization.

In some embodiments, if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.

In some embodiments, the antenna polarization pattern has a second association with the cell ID.

In some embodiments, the second association relationship is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and information DCI;

Alternatively, the second association relationship is obtained according to a predefined rule.

In some embodiments, the second association relationship is used for RRM measurement and/or RLM measurement of the neighboring cell.

In some embodiments, the third indication information is used to determine the antenna polarization mode, including one of the following situations:

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.

To implement the random access method provided by the embodiment of the present application, the embodiment of the present application further provides a network device. The optional composition structure of the network device 900, as shown in FIG. 17 , includes:

The second sending unit 901 is configured to send first indication information to the terminal device, where the first indication information includes fallback indication information and/or offset value indication information, the fallback indication information and/or the offset The value indication information is used for the terminal device to initiate random access.

In some embodiments, the first indication information includes at least one fallback indication information, and the at least one fallback indication information is used to determine the first fallback parameter.

In some embodiments, the first correspondence includes one of the following:

In some embodiments, the first correspondence is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the first correspondence is acquired according to a predefined rule.

In some embodiments, the second correspondence includes one of the following:

In some embodiments, the second correspondence is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

To implement the method for determining the antenna polarization mode provided by the embodiment of the present application, the embodiment of the present application further provides another network device. The optional composition structure of the network device 1000, as shown in FIG. 18 , includes:

The third sending unit 1001 is configured to send third indication information to the terminal device, where the third indication information is used to determine the antenna polarization mode.

The first association relationship is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.

In some embodiments, the second association relationship is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

In some embodiments, the third indication information of the method is used to determine the antenna polarization mode, including one of the following situations:

An embodiment of the present application further provides a terminal device, including a processor and a memory for storing a computer program that can be run on the processor, wherein the processor is configured to execute the program executed by the terminal device when the processor is running the computer program. Steps of a random access method.

An embodiment of the present application further provides a network device, including a processor and a memory for storing a computer program that can be run on the processor, wherein the processor is configured to execute the program executed by the network device when running the computer program. Steps of a random access method.

An embodiment of the present application further provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the random access method performed by the terminal device.

An embodiment of the present application further provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the random access method performed by the network device.

An embodiment of the present application further provides a storage medium storing an executable program, and when the executable program is executed by a processor, the random access method performed by the terminal device described above is implemented.

An embodiment of the present application further provides a storage medium storing an executable program, and when the executable program is executed by a processor, the random access method performed by the foregoing network device is implemented.

Embodiments of the present application further provide a computer program product, including computer program instructions, the computer program instructions enable a computer to execute the random access method executed by the above-mentioned terminal device.

Embodiments of the present application further provide a computer program product, including computer program instructions, the computer program instructions enable a computer to execute the random access method executed by the foregoing network device.

The embodiment of the present application further provides a computer program, the computer program enables the computer to execute the random access method executed by the terminal device.

The embodiment of the present application further provides a computer program, the computer program enables the computer to execute the random access method executed by the above-mentioned network device.

19 is a schematic diagram of a hardware structure of an electronic device (terminal device or network device) according to an embodiment of the present application. The electronic device 700 includes: at least one processor 701 , memory 702 and at least one network interface 704 . The various components in electronic device 700 are coupled together by bus system 705 . It can be understood that the bus system 705 is used to implement the connection communication between these components. In addition to the data bus, the bus system 705 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, the various buses are labeled as bus system 705 in FIG. 19 .

It will be appreciated that memory 702 may be either volatile memory or non-volatile memory, and may include both volatile and non-volatile memory. Among them, the non-volatile memory can be ROM, Programmable Read-Only Memory (PROM, Programmable Read-Only Memory), Erasable Programmable Read-Only Memory (EPROM, Erasable Programmable Read-Only Memory), Electrically Erasable Programmable Read-Only Memory Programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), magnetic random access memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM -ROM, Compact Disc Read-Only Memory); magnetic surface memory can be disk memory or tape memory. Volatile memory may be Random Access Memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory Memory (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM, Synchronous Dynamic Random Access Memory), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), Enhanced Type Synchronous Dynamic Random Access Memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), Synchronous Link Dynamic Random Access Memory (SLDRAM, SyncLink Dynamic Random Access Memory), Direct Memory Bus Random Access Memory (DRRAM, Direct Rambus Random Access Memory) ). The memory 702 described in the embodiments of the present application is intended to include, but not limited to, these and any other suitable types of memory.

The memory 702 in this embodiment of the present application is used to store various types of data to support the operation of the electronic device 700 . Examples of such data include: any computer program used to operate on electronic device 700, such as application 7022. The program for implementing the method of the embodiment of the present application may be included in the application program 7022 .

The methods disclosed in the above embodiments of the present application may be applied to the processor 701 or implemented by the processor 701 . The processor 701 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by an integrated logic circuit of hardware in the processor 701 or an instruction in the form of software. The above-mentioned processor 701 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The processor 701 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of this application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the electronic device 700 may be implemented by one or more of Application Specific Integrated Circuit (ASIC, Application Specific Integrated Circuit), DSP, Programmable Logic Device (PLD, Programmable Logic Device), Complex Programmable Logic Device (CPLD) , Complex Programmable Logic Device), FPGA, general-purpose processor, controller, MCU, MPU, or other electronic component implementation for performing the aforementioned method.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

It should be understood that the terms "system" and "network" in this application are often used interchangeably herein. The term "and/or" in this application is only an association relationship to describe associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, independently There are three cases of B. In addition, the character "/" in this application generally indicates that the related objects are an "or" relationship.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the within the scope of protection of this application.

Claims

A random access method, the method comprising:

The terminal device acquires first indication information, where the first indication information includes: fallback indication information and/or offset value indication information;

The terminal device initiates random access according to the fallback indication information and/or the offset value indication information.
The method according to claim 1, wherein the terminal device initiating random access according to the fallback indication information and/or the offset value indication information comprises:

determining, by the terminal device, a second fallback parameter according to the fallback indication information and/or the offset value indication information, where the offset value indication information is used to indicate the first offset value;

The terminal device initiates random access according to the second fallback parameter.
The method according to claim 1 or 2, wherein,

The first indication information includes one or more fallback indication information, and each of the fallback indication information corresponds to a first fallback parameter.
The method according to claim 3, wherein the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 4, wherein the first correspondence includes one of the following:

A fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters;

One fallback indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two fallback indications correspond to one coverage enhancement level and/or a set of random access parameters.
The method according to claim 4 or 5, wherein the first correspondence includes system messages, paging messages, wake-up signals, radio resource control RRC signaling, medium access control control unit MAC CE and downlink control information DCI at least one of the acquisition;

Alternatively, the first correspondence is acquired according to a predefined rule.
The method according to any one of claims 4 to 6, wherein,

determining, by the terminal device, a first coverage enhancement level and/or a first set of random access parameters;

The terminal device determines the first fallback corresponding to the first coverage enhancement level and/or the first set of random access parameters in the at least one fallback indication information based on the first correspondence parameter.
The method according to any one of claims 1 to 7, wherein the offset value indication information includes at least one offset value, and the at least one offset value is used to determine the first offset value.
The method of claim 8, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 9, wherein the second correspondence includes one of the following:

An offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

One offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The method according to claim 9 or 10, wherein the second correspondence is obtained through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the second corresponding relationship is acquired according to a predefined rule.
The method according to any one of claims 8 to 11, wherein,

determining, by the terminal device, a first coverage enhancement level and/or a first set of random access parameters;

The terminal device determines the first offset value corresponding to the first coverage enhancement level and/or the first set of random access parameters in the at least one offset value based on the second correspondence .
The method according to claim 7 or 12, wherein the terminal device determines the first coverage enhancement level and/or the first set of random access parameters, including at least one of the following situations:

determining, by the terminal device, the first coverage enhancement level and/or the first group of random access parameters corresponding to the terminal device according to the capability of the terminal device;

The terminal device determines the first coverage enhancement level and/or the first group of random access parameters according to the measurement result of the RSRP of the reference signal;

The terminal device determines the first coverage enhancement level and/or the first set of random access parameters according to the second indication information sent by the network device.
The method according to claim 13, wherein the second indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The method according to claim 13 or 14, wherein the second indication information is determined according to the capability reported by the terminal device.
The method according to any one of claims 1 to 15, wherein the terminal device initiates random access according to the fallback indication information and/or the offset value indication information, comprising:

determining, by the terminal device, a first physical random access channel PRACH resource based on the fallback indication information and/or the offset value indication information;

The terminal device sends PRACH on the first PRACH resource.
The method according to claim 16, wherein the terminal device determines the first physical random access channel PRACH resource based on the backoff indication information and/or the offset value indication information, comprising:

The terminal device determines a first backoff parameter value based on the backoff indication information, randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, and based on the first backoff parameter value. A backoff time determines the first PRACH resource; or,

The terminal device determines a first backoff parameter value based on the backoff indication information, randomly selects a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, and based on the first backoff parameter value. A backoff time and the first offset value determine the first PRACH resource; or,

The terminal device determines a first backoff parameter value based on the backoff indication information, and randomly selects the first backoff parameter value from 0 and a uniformly distributed value between the sum of the first backoff parameter value and the first offset value. a backoff time, and the first PRACH resource is determined based on the first backoff time.
The method according to any one of claims 1 to 17, wherein the first indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The method according to any one of claims 1 to 18, wherein the fallback indication information and the offset value indication information can be carried in the same information;

Alternatively, the fallback indication information and the offset value indication information may be carried in different pieces of information.
A method for determining an antenna polarization mode, the method comprising:

The terminal device acquires the antenna polarization mode based on the third indication information, where the third indication information is used to determine the antenna polarization mode.
The method according to claim 20, wherein the terminal device obtains the third indication information according to a predefined rule; or,

The terminal device receives the third indication information sent by the network device.
The method according to claim 21, wherein the terminal device receives the third indication information sent by the network device, and the third indication information is obtained through a system message, a paging message, a wake-up signal, and radio resource control (RRC) signaling. , carried by at least one of the medium access control control unit MAC CE and the downlink control information DCI.
The method of any one of claims 20 to 22, wherein the antenna polarization pattern comprises:

Downlink antenna polarization pattern and/or uplink antenna polarization pattern.
24. The method of claim 23, wherein the downlink antenna polarization mode and the uplink antenna polarization mode have a first correlation.
The method according to claim 24, wherein the first association relationship comprises: the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; and/or,

The first association relationship is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The method according to any one of claims 23 to 25, wherein the downlink antenna polarization mode comprises at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The method according to any one of claims 23 to 26, wherein the uplink antenna polarization mode comprises at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The method according to any one of claims 20 to 27, wherein the third indication information is used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization.
The method according to any one of claims 20 to 28, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The method according to any one of claims 20 to 29, wherein the antenna polarization mode has a second association relationship with the cell identification ID.
The method according to claim 30, wherein the second association relationship is performed through system messages, paging messages, wake-up signals, radio resource control (RRC) signaling, medium access control control elements (MAC CE) and downlink control information (DCI). at least one carry;

Alternatively, the second association relationship is obtained according to a predefined rule.
The method according to claim 30 or 31, wherein the second association relationship is used for radio resource management RRM measurement and/or radio link monitoring RLM measurement of the neighboring cell.
The method according to any one of claims 20 to 32, wherein the third indication information is used to determine an antenna polarization mode, including one of the following situations:

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A random access method, the method comprising:

The network device sends first indication information to the terminal device, where the first indication information includes fallback indication information and/or offset value indication information, and the fallback indication information and/or the offset value indication information are used for all The terminal device initiates random access.
The method according to claim 34, wherein the first indication information includes one or more fallback indication information, and each of the fallback indication information corresponds to a first fallback parameter.
The method of claim 35, wherein the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 36, wherein the first correspondence includes one of the following:

A fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters;

One fallback indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two fallback indications correspond to one coverage enhancement level and/or a set of random access parameters.
The method according to claim 36 or 37, wherein the first correspondence is carried in a system message, a paging message, a wake-up signal, a radio resource control (RRC) signaling, a medium access control control unit (MAC CE) and a DCI. at least one;

Alternatively, the first correspondence is acquired according to a predefined rule.
The method according to any one of claims 34 to 38, wherein the offset value indication information includes at least one offset value, and the at least one offset value is used to determine the first offset value.
The method of claim 39, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The method of claim 40, wherein the second correspondence includes one of the following:

An offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

One offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The method according to claim 40 or 41, wherein the second correspondence is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the second corresponding relationship is acquired according to a predefined rule.
The method according to any one of claims 34 to 42, wherein the first indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The method according to any one of claims 34 to 43, wherein the fallback indication information and the offset value indication information can be carried in the same information;

Alternatively, the fallback indication information and the offset value indication information may be carried in different pieces of information.
A method for determining an antenna polarization mode, the method comprising:

The network device sends third indication information to the terminal device, where the third indication information is used to determine the antenna polarization mode.
The method according to claim 45, wherein the third indication information is obtained through a system message, a paging message, a wake-up signal, a radio resource control (RRC) signaling, a medium access control control unit (MAC CE), and a downlink control information (DCI). At least one carry.
The method of claim 45 or 46, wherein the antenna polarization pattern comprises:

Downlink antenna polarization pattern and/or uplink antenna polarization pattern.
48. The method of claim 47, wherein the downlink antenna polarization pattern has a first association with the uplink antenna polarization pattern.
The method according to claim 48, wherein the first association relationship comprises: the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; and/or,

The first association relationship is carried in at least one of system messages, paging messages, wake-up signals, radio resource control RRC signaling, medium access control control unit MAC CE and downlink control information DCI.
The method according to any one of claims 47 to 49, wherein the downlink antenna polarization mode comprises at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The method according to any one of claims 49 to 50, wherein the uplink antenna polarization mode comprises at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The method according to any one of claims 45 to 50, wherein the third indication information is used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization.
The method according to any one of claims 45 to 52, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The method according to any one of claims 45 to 53, wherein the antenna polarization mode has a second association relationship with the cell identification ID.
The method according to claim 54, wherein the second association relationship is carried in system messages, paging messages, wake-up signals, radio resource control RRC signaling, medium access control control unit MAC CE and downlink control information DCI at least one of;

Alternatively, the second association relationship is obtained according to a predefined rule.
The method according to claim 54 or 55, wherein the second association relationship is used for radio resource management RRM measurement and/or radio link monitoring RLM measurement of the neighboring cell.
The method according to any one of claims 45 to 56, wherein the third indication information of the method is used to determine an antenna polarization mode, including one of the following situations:

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A terminal device, the terminal device includes:

a first processing unit, configured to obtain first indication information, wherein the first indication information includes: fallback indication information and/or offset value indication information;

A first sending unit, configured to initiate random access according to the fallback indication information and/or the offset value indication information.
The terminal device according to claim 58, wherein the first processing unit is configured to determine a second fallback parameter according to the fallback indication information and/or the offset value indication information, wherein the offset The shift value indication information is used to indicate the first offset value;

The first sending unit is configured to initiate random access according to the second fallback parameter.
The terminal device according to claim 58 or 59, wherein the first indication information includes one or more fallback indication information, and each of the fallback indication information corresponds to a first fallback parameter.
The terminal device according to claim 60, wherein the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The terminal device according to claim 61, wherein the first correspondence includes one of the following:

A fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters;

One fallback indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two fallback indications correspond to one coverage enhancement level and/or a set of random access parameters.
The terminal device according to claim 61 or 62, wherein the first correspondence is determined by means of system messages, paging messages, wake-up signals, radio resource control (RRC) signaling, medium access control elements (MAC CE) and DCI. at least one acquisition;

Alternatively, the first correspondence is acquired according to a predefined rule.
The terminal device according to any one of claims 61 to 63, wherein,

The first processing unit is configured to determine a first coverage enhancement level and/or a first group of random access parameters; and based on the first correspondence, determine the first coverage in the at least one fallback indication information The enhancement level and/or the first fallback parameter corresponding to the first group of random access parameters.
The terminal device according to any one of claims 58 to 64, wherein the offset value indication information includes at least one offset value, and the at least one offset value is used to determine the first offset value.
The terminal device of claim 65, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The terminal device according to claim 66, wherein the second correspondence includes one of the following:

An offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

One offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The terminal device according to claim 66 or 67, wherein the second correspondence is obtained through at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the second corresponding relationship is acquired according to a predefined rule.
The terminal device according to any one of claims 65 to 68, wherein,

The first processing unit is configured to determine a first coverage enhancement level and/or a first set of random access parameters; and based on the second correspondence, determine the first coverage enhancement in the at least one offset value level and/or the first offset value corresponding to the first group of random access parameters.
The terminal device according to claim 64 or 69, wherein the first processing unit is configured to perform at least one of the following:

determining the first coverage enhancement level and/or the first group of random access parameters corresponding to the terminal device according to the capability of the terminal device;

determining the first coverage enhancement level and/or the first group of random access parameters according to the measurement result of the reference signal received power RSRP;

The first coverage enhancement level and/or the first group of random access parameters are determined according to the second indication information sent by the network device.
The terminal device according to claim 70, wherein the second indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The terminal device according to claim 70 or 71, wherein the second indication information is determined according to a capability reported by the terminal device.
The terminal device according to any one of claims 58 to 72, wherein,

The first sending unit is configured to determine a first physical random access channel PRACH resource based on the backoff indication information and/or the offset value indication information; and send PRACH on the first PRACH resource.
The terminal device of claim 73, wherein,

The first sending unit is configured to determine a first backoff parameter value based on the backoff indication information, and randomly select a first backoff time from values uniformly distributed between 0 and the first backoff parameter value, and determining the first PRACH resource based on the first backoff time; or,

A first backoff parameter value is determined based on the backoff indication information, a first backoff time is randomly selected from values uniformly distributed between 0 and the first backoff parameter value, and based on the first backoff time and the first offset value to determine the first PRACH resource; or,

A first backoff parameter value is determined based on the backoff indication information, and a first backoff time is randomly selected from a value uniformly distributed between 0 and the sum of the first backoff parameter value and the first offset value , and the first PRACH resource is determined based on the first backoff time.
The terminal device according to any one of claims 58 to 74, wherein the first indication information is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The terminal device according to any one of claims 58 to 74, wherein the fallback indication information and the offset value indication information can be carried in the same information;

Alternatively, the fallback indication information and the offset value indication information may be carried in different pieces of information.
A terminal device, the terminal device includes:

The second processing unit is configured to acquire the antenna polarization mode based on third indication information, wherein the third indication information is used to determine the antenna polarization mode.
The terminal device of claim 77, wherein,

The second processing unit is configured to acquire the third indication information according to a predefined rule; or, receive the third indication information sent by the network device.
The terminal device according to claim 78, wherein the third indication information includes system messages, paging messages, wake-up signals, radio resource control RRC signaling, medium access control control unit MAC CE and downlink control information DCI of at least one carry.
The terminal device according to any one of claims 77 to 79, wherein the antenna polarization mode comprises:

Downlink antenna polarization pattern and/or uplink antenna polarization pattern.
The terminal device of claim 80, wherein the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relationship.
The terminal device according to claim 81, wherein the first association relationship comprises: the polarization mode of the downlink antenna is the same as the polarization mode of the uplink antenna; and/or,

The first association relationship is carried by at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The terminal device according to any one of claims 80 to 82, wherein the downlink antenna polarization mode includes at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The terminal device according to any one of claims 80 to 83, wherein the uplink antenna polarization mode includes at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The terminal device according to any one of claims 77 to 84, wherein the third indication information is used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization.
The terminal device according to any one of claims 77 to 85, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The terminal device according to any one of claims 77 to 86, wherein the antenna polarization mode and the cell identification ID have a second association relationship.
The terminal device according to claim 87, wherein the second association relationship is determined by a system message, a paging message, a wake-up signal, a radio resource control (RRC) signaling, a medium access control control unit (MAC CE), and a downlink control information (DCI). at least one kind of carry;

Alternatively, the second association relationship is obtained according to a predefined rule.
The terminal device according to claim 87 or 88, wherein the second association relationship is used for radio resource management RRM measurement and/or radio link monitoring RLM measurement of the neighboring cell.
The terminal device according to any one of claims 77 to 89, wherein the third indication information is used to determine an antenna polarization mode, including one of the following situations:

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A network device, the network device comprising:

The second sending unit is configured to send first indication information to the terminal device, where the first indication information includes fallback indication information and/or offset value indication information, the fallback indication information and/or the offset value The indication information is used for the terminal device to initiate random access.
The network device according to claim 91, wherein the first indication information includes one or more fallback indication information, and each of the fallback indication information corresponds to a first fallback parameter.
The network device according to claim 92, wherein the at least one fallback indication information has a first correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The network device according to claim 93, wherein the first correspondence includes one of the following:

A fallback indication information corresponds to a coverage enhancement level and/or a set of random access parameters;

One fallback indication information corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two fallback indications correspond to one coverage enhancement level and/or a set of random access parameters.
The network device according to claim 93 or 94, wherein the first correspondence is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the first correspondence is acquired according to a predefined rule.
The network device according to any one of claims 91 to 95, wherein the offset value indication information includes at least one offset value, and the at least one offset value is used to determine the first offset value.
The network device of claim 96, wherein the at least one offset value has a second correspondence with at least one coverage enhancement level and/or at least one set of random access parameters.
The network device of claim 97, wherein the second correspondence includes one of the following:

An offset value corresponds to a coverage enhancement level and/or a set of random access parameters;

One offset value corresponds to at least two coverage enhancement levels and/or at least two sets of random access parameters;

At least two offset values correspond to a coverage enhancement level and/or a set of random access parameters.
The network device according to claim 97 or 98, wherein the second correspondence is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI;

Alternatively, the second corresponding relationship is acquired according to a predefined rule.
The network device according to any one of claims 91 to 99, wherein the first indication information is carried by at least one of a system message, a paging message, a wake-up signal, RRC signaling, MAC CE and DCI.
The network device according to any one of claims 91 to 100, wherein the fallback indication information and the offset value indication information can be carried in the same information;

Alternatively, the fallback indication information and the offset value indication information may be carried in different pieces of information.
A network device, the network device comprising:

The third sending unit is configured to send third indication information to the terminal device, where the third indication information is used to determine the antenna polarization mode.
The network device according to claim 102, wherein the third indication information is stored in a system message, a paging message, a wake-up signal, a radio resource control (RRC) signaling, a medium access control control unit (MAC CE) and downlink control information (DCI). of at least one carry.
The network device of claim 102 or 103, wherein the antenna polarization pattern comprises:

Downlink antenna polarization pattern and/or uplink antenna polarization pattern.
The network device of claim 101, wherein the downlink antenna polarization mode and the uplink antenna polarization mode have a first association relationship.
The network device according to claim 102, wherein the first association relationship comprises: the downlink antenna polarization mode is the same as the uplink antenna polarization mode; and/or,

The first association relationship is carried in at least one of system messages, paging messages, wake-up signals, RRC signaling, MAC CE and DCI.
The network device according to any one of claims 104 to 106, wherein the downlink antenna polarization mode includes at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The network device according to any one of claims 104 to 107, wherein the uplink antenna polarization mode includes at least one of the following:

Right hand polarization, left hand polarization and linear polarization.
The network device according to any one of claims 103 to 108, wherein the third indication information is used to indicate that the antenna polarization mode is right-handed polarization or left-handed polarization.
The network device according to any one of claims 103 to 109, wherein if the third indication information does not indicate an antenna polarization mode, the antenna polarization mode is linear polarization.
The network device according to any one of claims 102 to 110, wherein the antenna polarization mode and the cell identification ID have a second association relationship.
The network device according to claim 111, wherein the second association relationship is carried in system messages, paging messages, wake-up signals, radio resource control (RRC) signaling, medium access control elements (MAC CE) and downlink control information (DCI) at least one of;

Alternatively, the second association relationship is obtained according to a predefined rule.
The network device according to claim 111 or 112, wherein the second association relationship is used for radio resource management RRM measurement and/or radio link monitoring RLM measurement of the neighboring cell.
The network device according to any one of claims 102 to 113, wherein the third indication information is used to determine an antenna polarization mode, including one of the following situations:

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is the same as the downlink antenna polarization mode;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is the same as the uplink antenna polarization mode;

The third indication information indicates a downlink antenna polarization mode, and the uplink antenna polarization mode is a default configuration;

The third indication information indicates an uplink antenna polarization mode, and the downlink antenna polarization mode is a default configuration;

The third indication information indicates a downlink antenna polarization mode and an uplink antenna polarization mode.
A terminal device comprising a processor and a memory for storing a computer program that can run on the processor, wherein,

The processor is configured to execute the steps of the random access method according to any one of claims 1 to 19 when running the computer program.
A terminal device comprising a processor and a memory for storing a computer program that can run on the processor, wherein,

The processor is configured to execute the steps of the method for determining an antenna polarization mode according to any one of claims 20 to 33 when running the computer program.
A network device comprising a processor and a memory for storing a computer program executable on the processor, wherein,

The processor is configured to execute the steps of the random access method according to any one of claims 34 to 44 when running the computer program.
A network device comprising a processor and a memory for storing a computer program executable on the processor, wherein,

The processor is configured to execute the steps of the method for determining an antenna polarization mode according to any one of claims 45 to 57 when running the computer program.
A storage medium that stores an executable program, and when the executable program is executed by a processor, implements the random access method described in any one of claims 1 to 19; or, implements any one of claims 34 to 44 the random access method.
A storage medium that stores an executable program, and when the executable program is executed by a processor, implements the method for determining an antenna polarization mode according to any one of claims 20 to 33; or, implements any one of claims 45 to 57. A method for determining an antenna polarization mode.
A computer program product comprising computer program instructions that cause a computer to perform the random access method as claimed in any one of claims 1 to 19; or, perform the random access method as claimed in any one of claims 34 to 44 random access method.
A computer program product comprising computer program instructions, the computer program instructions cause a computer to perform the random access method as claimed in any one of claims 20 to 33; or, to perform the random access method as claimed in any one of claims 45 to 57 random access method.
A computer program, the computer program causing a computer to execute the random access method as claimed in any one of claims 1 to 19; or, to execute the random access method as claimed in any one of claims 34 to 44.
A computer program, the computer program causing a computer to execute the random access method as claimed in any one of claims 20 to 33; or, to execute the random access method as claimed in any one of claims 45 to 57.
A chip, comprising: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the random access method according to any one of claims 1 to 19; The random access method according to any one of claims 34 to 44.
A chip, comprising: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the random access method according to any one of claims 20 to 33; The random access method according to any one of claims 45 to 57.